S C S E N E R G Y

CAPSTONE 30 kW AND 60 kW MICROTURBINECAPSTONE 30 kW AND 60 kW MICROTURBINEINSTALLATIONS AT LANDFILLSINSTALLATIONS AT LANDFILLS

Intermountain CHP Application Center WorkshopIntermountain CHP Application Center WorkshopCHP and CHP and BioenergyBioenergy for Landfills andfor Landfills and

Wastewater Treatment PlantsWastewater Treatment Plants

August 11, 2005August 11, 2005Salt Lake City, UtahSalt Lake City, Utah

Jeffrey L. Pierce, P.E.Jeffrey L. Pierce, P.E.Vice President Vice President SCS EnergySCS Energy

Long Beach, CaliforniaLong Beach, California

S C S E N E R G Y

Capstone 30 kW MicroturbineCapstone 30 kW Microturbine

Available for biogas service for over five yearsAvailable for biogas service for over five years

Have been installed in arrays of one to fifty unitsHave been installed in arrays of one to fifty units

Heat rate = 13,100 Btu/kWh (LHV)Heat rate = 13,100 Btu/kWh (LHV)

Heat recovery optionalHeat recovery optionalOne heat exchanger per microturbine or multiple units to single One heat exchanger per microturbine or multiple units to single heat exchangerheat exchanger

About 190,000 Btu/hr of hot waterAbout 190,000 Btu/hr of hot water

Radiator or exhaust bypass for regulation of heat recoveryRadiator or exhaust bypass for regulation of heat recovery

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New Jersey: 1New Jersey: 1stst LFG CHPLFG CHPRutgers University EcoComplexRutgers University EcoComplex

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Capstone 60 kW MicroturbineCapstone 60 kW Microturbine

Will be available for biogas in early 2006Will be available for biogas in early 2006

Expected heat rate = 12,200 Btu/kWh (LHV)Expected heat rate = 12,200 Btu/kWh (LHV)

Expected heat recoveryExpected heat recoveryAbout 375,000 Btu/hrAbout 375,000 Btu/hr

Same options for heat recovery as for C30Same options for heat recovery as for C30

Likely cost (without heat recovery) of about $56,000 Likely cost (without heat recovery) of about $56,000 ($930/kW) versus $34,000 ($1,130/kW) for 30 kW ($930/kW) versus $34,000 ($1,130/kW) for 30 kW machinemachine

S C S E N E R G Y

Hot Water CHP: Biogas C60Hot Water CHP: Biogas C60--ICHPICHP

Optional integrated stainless steel heat exchanger Optional integrated stainless steel heat exchanger designed & designed & manufactured by manufactured by Capstone TurbineCapstone Turbine

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Calabasas LandfillCalabasas Landfill

Ten Capstone 30 kW microturbinesTen Capstone 30 kW microturbines

300 kW 300 kW ((grossgross)) / 250 kW / 250 kW ((netnet))

Microturbine inlet pressure = 80 psigMicroturbine inlet pressure = 80 psig

30% to 45% methane content30% to 45% methane content

HH22S = 75 / siloxanes = 705 S = 75 / siloxanes = 705 ppbvppbv

80 psig sliding vane compressor / chilling of gas to 40º F / 80 psig sliding vane compressor / chilling of gas to 40º F / reheat of gas by 20º F / activated carbon and silica gelreheat of gas by 20º F / activated carbon and silica gel

S C S E N E R G Y

Calabasas LandfillCalabasas Landfill

Capital cost = $770,000 Capital cost = $770,000 (($2,570/kW$2,570/kW))

O&M cost = 2.5¢/kWhO&M cost = 2.5¢/kWh

Onsite retail deferral at 15¢/kWhOnsite retail deferral at 15¢/kWh

Interconnection cost = $5,000 Interconnection cost = $5,000 (($16/kW$16/kW))

Design/construction duration = 5 monthsDesign/construction duration = 5 months

Simple payback Simple payback ((after grantsafter grants)) = 1.6 years= 1.6 years

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Capstone C30 Air Emissions at Calabasas LandfillCapstone C30 Air Emissions at Calabasas Landfill

NONOxx

COCO

VOCsVOCs

NMOC DestructionNMOC Destruction

S C S E N E R G Y

ConclusionsConclusions

Capstone microturbines are a relatively proven Capstone microturbines are a relatively proven technology for biogas fuels (35% or less methane)technology for biogas fuels (35% or less methane)

They are primarily applicable to distributed generation They are primarily applicable to distributed generation projects, but have been used for large sale to grid projects, but have been used for large sale to grid projectsprojects

High retail power costs and financial incentives can High retail power costs and financial incentives can result in economically feasible projectsresult in economically feasible projects